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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.59: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Observing g(2)(0) at the lasing threshold with samplerates up to 1 MHz — •Johannes Thewes, Carolin Lüders, and Marc Aßmann — Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany
Monitoring fast changes in the photon statistics of a light source, such as a diode laser driven close to its lasing threshold, demands a high speed evaluation of the second order correlation function g(2)(0). By employing an optical homodyne detection scheme, we achieved samplerates of up to 1 MHz for g(2)(0). Thus, we could observe how and on what time scales the light emitted from a diode laser driven close to its lasing threshold switches back and forth between Poissonian and super-Poissonian photon statistics, which indicate coherent and thermal light respectively. In this way, we are able to perform a detailed analysis of the coherence dynamics at the lasing threshold. In sum, our work demonstrates the feasibility of sampling g(2)(0) with up to 1 MHz and enables future research and applications with other light sources such as polaritons in microcavities or optical quantum memories.